I would expect those actions fall into the case of "actions within the normal course of employement". Much like if an employee makes an honest mistake doing what they are contracted to do wouldn't leave them liable at work.You are wrong - you can tell you are wrong as loads of footballers have done what you say is not legal.
https://www.theguardian.com/football/2012/jul/04/robin-van-persie-arsenal-no-deal
http://www.dailymail.co.uk/sport/fo...eer-maverick-striker-turned-Chievo-offer.html
Doing something outside the scope of their employment (going to play army) would make them liable for damages. Imagine an IT director downloaded some games, installed them on a server and used it to play during lunch. Those actions then led to £Ms lost data. That person could be liable for large amounts of those costs, even if their contract says nothing about it.